2016 Cherokee strut.

Hi all. My MIL's 2016 Cherokee has the LF strut leaking out. It's 4x4 w 2.4 engine. One parts store quoted me the strut but says requires a retainer which he can't supply right now. He can supply the mount which includes the retainer for $105. That's almost as much as the $120 strut.
1, do I really need this retainer?
The mount is quiet and smooth.
2, besides spring compressor and alignment what specialty tools will be needed.
3, should I just get the "quick strut"?